Earlier, most of the time I would see an Epic/Rare visible on my map/radar (within view range) and then go to that location to pick them up.
Recently, there have been more and more occurrences where the Epics/Rare do not appear on the map initially but spawn within your range when you walk over a particular spot on the map. Earlier this used to happen mainly for random commons when you walk over to a place where there are no dinosaurs.
Is this something new they have put for including a surprise aspect of stumbling upon them??